Shoe insole

ABSTRACT

A shoe insole is injection molded from composite materials, the composite materials includes 62%-80% by weight of nylon and 20%-38% by weight of short fiber material.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a shoe insole, and more particularly to a shoe insole that has a suitable hardness and flexibility.

2. Description of the Prior Art

A shoe insole includes an anti-friction outsole, an anti-vibration a midsole and a shoe vamp.

An outsole or midsole of a conventional bicycle riding shoes includes a multi-layer fiber material with high hardness to protect a sole of the foot. To facilitate force of the sole by using a ball portion and a foot arch, a hell portion is designed to raise slightly. Also, to abut the hell portion against a pedal of a bicycle, a hook member is disposed on a lower side of an outsole. TW Patent No. M338207 discloses that an outsole includes a base layer and a reinforcement layer to enhance strength of the outsole. However, such a bicycle riding shoe can not be used to walk comfortably because of the raised hell portion, limiting its usage.

To improve abovementioned defects, a safety shoe insole is disclosed in the TW Patent No. 273234, wherein an adhesive with flexibility is formed between a plurality of safety shoe insoles to provide an anti-impact function. Likewise, the TW Patent No. 290677 discloses that between two clamp layers is defined a plastic layer to provide flexibility. The TW Patent No. M347839 disclosed that a PU glue is coated among a number of polyester fiber layers, and the PU glue is mixed with hard particles to prevent pointed articles from piercing through the shoe. In addition, a polymer layer made of polyurethane is adhered with a fiber layer to reinforce mechanical strength.

Nevertheless, abovementioned patents all have to provide with at least two layer members, causing complicate manufacturing process and high production cost.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide a shoe insole that can has a suitable hardness and flexibility.

A shoe insole in accordance with the present invention is injection molded from composite materials, the composite materials comprises: 62%-80% by weight of nylon and 20%-38% by weight of short fiber material.

Thereby, as riding a bicycle, the shoe insole can be placed into the shoe easily to reinforce support capacity, hardness, and rigidity to the foot. A proportion of the short fiber material is limited within 20% to 38% to prevent insufficient hardness and support capacity and energy consumption.

The shoe insole of the present invention can be applied in dangerous condition and can be also served as a protective layer to protect the sole of foot.

In addition, the shoe insole is light weight, removable and replaceable to be used in different environments.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic view showing the manufacturing process of a shoe insole in accordance with the present invention;

FIG. 2 is a perspective view of the shoe insole in accordance with a preferred embodiment of the present invention;

FIG. 3 is a side plan view of the shoe insole in accordance with the preferred embodiment of the present invention;

FIG. 4 is another perspective view of the shoe insole in accordance with the preferred embodiment of the present invention;

FIG. 5 is a perspective view showing composite material of the present invention being forced to deform;

FIG. 6 is an operational view of the shoe insole in accordance with the preferred embodiment of the present invention;

FIG. 7 is another operational view of the shoe insole in accordance with the preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention will be clearer from the following description when viewed together with the accompanying drawings, which show, for purpose of illustrations only, the preferred embodiment in accordance with the present invention.

Referring to FIGS. 1, 1A, and 2, a shoe insole with hardness and flexibility in accordance with the present invention is injection molded from composite materials. The composite materials includes 62%-80% by weight of nylon and 20%-38% by weight of short fiber material, wherein less than 1 weight percent concentration of additions can be added as required. The abovementioned nylon is selected from nylon 6 and nylon 66, and the short fiber material is selected from glass fiber and carbon fiber. A preferred length of the short fiber material is 3 mm to 5 mm.

As shown in FIG. 1, a substantial method for making a shoe insole includes melting nylon plastic pellets mixed with short fiber material by heating so that the short fiber material is equally mixed with the nylon plastic pellets, and encapsulating the melted mixed nylon and short fiber material into a mold. After molding, the shoe insole is finished. Thereby, the advantages of the present invention, such as a simple manufacturing process, a lower production cost, can be achieved.

As illustrated in FIGS. 2-4, a molded shoe insole 1 is formed in a sole shape, the shoe insole 1 includes an upper surface and a lower surface, and further includes a ball portion 10, a foot arch portion 20, and a heel portion 30, wherein to satisfy a bicycle-riding condition, the foot arch portion 20 and the heel portion 30 are designed to raise slightly, e.g., between the foot arch portion 20, the heel portion 30, and the ball portion 10 forms a suitable included angle, wherein a largest deformation rate of the ball portion 10 is within 20%-35%, and a largest deformation rate of the foot arch portion 20 and the heel portion 30 is within 10%-25%, thereby the shoe insole 1 has a suitable loading capacity to facilitate ball portion's force as walking. Referring to FIG. 5, the abovementioned deformation rate means that as a 3 mm of shoe insole is forced and not be broken, a largest deformation of a thickness direction is a, and a largest deformation of a length is b. A relation between a and b denotes as follows:

$\left( {\frac{a}{b} \times 100\%} \right)$

Moreover, to reinforce the structure of the shoe insole, on a lower surface of the foot arch portion 20 and the heel portion 30 is formed at least one rib 40 extending along a length direction of the shoe insole 1, a preferred number of the ribs is two or three, and the ribs 40 allow to match a curve line of the shoe insole to be formed in a slight curve shape, wherein a thickness of the shoe insole 1, on which are arranged the ribs 40, is approximately 4 mm to 6 mm, and the rest portion of the shoe insole 1 is about 3 mm so as to enhance insole's strength and lower its weight. Likewise, a side periphery of the shoe insole 1 allows to be further chamfered to prevent generating a sharp-pointed periphery.

Referring further to FIG. 6, the shoe insole 1 is directly placed in a shoe 5 to be stepped by a user, and because a plurality of bosses 41 are formed on an upper surface of the shoe insole 1 to abut against user's ball portion, obtaining an anti-slip function. Besides, the reflex nerve in the sole of the foot is stimulated to exercise and be massaged, and the user's sole will not completely contact with the shoe insole, enhancing air permeability.

As illustrated in FIG. 7, after the shoe insole 1 is placed in the shoe 5, another shoe insole 6 is placed into the shoe, or an air permeable foam layer is additionally adhered onto the shoe insole 1 so that the user can wear the shoe comfortably.

From abovementioned descriptions, the nylon and the short fiber material are mixed together at an appropriate proportion, and because the short fiber material is arranged in an irregular direction to cross with the nylon in the shoe insole, the short fiber material can be used to reinforce hardness and rigidity. Under a test, the composite materials made from the nylon and the short fiber material can be up to 1600 kgf/cm² in a tensile strength (according to ASTM D-638 standard) and be up to 2500 kgf/cm² in a flexural strength (according to ASTM D-790 standard), and a hardness grade for Rockwell R can be up to 120 (according to D-785 standard). Therefore, the mechanical strength of the shoe insole of the present invention is more excellent than that of conventional shoe insole, and a rate of recovery to the deformation is less than 5%.

Thereby, as riding a bicycle, the shoe insole can be placed into the shoe easily to reinforce support capacity, hardness, and rigidity to the foot. Since a proportion of the short fiber material is limited within 20% to 38%, preventing insufficient hardness and support capacity and energy consumption.

The shoe insole of the present invention can be applied in dangerous condition and can be also served as a protective layer to protect the sole of foot.

In addition, the shoe insole is light weight, removable and replaceable to be used in different environments.

While we have shown and described various embodiments in accordance with the present invention, it is clear to those skilled in the art that further embodiments may be made without departing from the scope of the present invention. 

1. A shoe insole being injection molded from composite materials, the composite materials comprising: 62%-80% by weight of nylon and 20%-38% by weight of short fiber material.
 2. The shoe insole as claimed in claim 1, wherein the short fiber material is selected from glass fiber and carbon fiber.
 3. The shoe insole as claimed in claim 2, wherein a length of the short fiber material is 3 mm to 5 mm.
 4. The shoe insole as claimed in claim 1, wherein the short fiber material is arranged in the composite material in an irregular direction.
 5. The shoe insole as claimed in claim 2, wherein the short fiber material is arranged in the composite material in an irregular direction.
 6. The shoe insole as claimed in claim 3, wherein the short fiber material is arranged in the composite material in an irregular direction.
 7. The shoe insole as claimed in claims 1, wherein a shoe insole is formed in a sole shape and includes a ball portion, a foot arch portion, and a heel portion, and the foot arch portion and the heel portion are designed to raise slightly.
 8. The shoe insole as claimed in claims 2, wherein a shoe insole is formed in a sole shape and includes a ball portion, a foot arch portion, and a heel portion, and the foot arch portion and the heel portion are designed to raise slightly.
 9. The shoe insole as claimed in claims 3, wherein a shoe insole is formed in a sole shape and includes a ball portion, a foot arch portion, and a heel portion, and the foot arch portion and the heel portion are designed to raise slightly.
 10. The shoe insole as claimed in claims 4, wherein a shoe insole is formed in a sole shape and includes a ball portion, a foot arch portion, and a heel portion, and the foot arch portion and the heel portion are designed to raise slightly.
 11. The shoe insole as claimed in claims 5, wherein a shoe insole is formed in a sole shape and includes a ball portion, a foot arch portion, and a heel portion, and the foot arch portion and the heel portion are designed to raise slightly.
 12. The shoe insole as claimed in claims 6, wherein a shoe insole is formed in a sole shape and includes a ball portion, a foot arch portion, and a heel portion, and the foot arch portion and the heel portion are designed to raise slightly.
 13. The shoe insole as claimed in claim 7, wherein on a lower surface of the foot arch portion and the heel portion is formed at least one rib extending along a length direction of the shoe insole.
 14. The shoe insole as claimed in claim 8, wherein on a lower surface of the foot arch portion and the heel portion is formed at least one rib extending along a length direction of the shoe insole.
 15. The shoe insole as claimed in claim 9, wherein on a lower surface of the foot arch portion and the heel portion is formed at least one rib extending along a length direction of the shoe insole.
 16. The shoe insole as claimed in claim 10, wherein on a lower surface of the foot arch portion and the heel portion is formed at least one rib extending along a length direction of the shoe insole.
 17. The shoe insole as claimed in claim 11, wherein on a lower surface of the foot arch portion and the heel portion is formed at least one rib extending along a length direction of the shoe insole.
 18. The shoe insole as claimed in claim 12, wherein on a lower surface of the foot arch portion and the heel portion is formed at least one rib extending along a length direction of the shoe insole.
 19. The shoe insole as claimed in claim 1, wherein the shoe insole includes an upper and a lower surfaces, and a plurality of bosses are formed on the upper surface of the shoe insole.
 20. The shoe insole as claimed in claim 19, wherein a largest deformation rate of the ball portion is within 20%-35%, and a largest deformation rate of the foot arch portion and the heel portion is within 10%-25%. 